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Manufacturer Resources
Product Specs
- Colour:
- Natural colour
- Material Of Construction:
- Steel
- Material Quality:
- Steel
- Nominal Thread Size Inch Gas Pipe Thread:
- 3 1/2 inch
- Outer Dimensions Inches :
- 9.25x7.25x4.75
- Outer Quantity:
- 25
- Standard:
- UL E23018
- Surface Protection:
- Other
- Thread Type:
- NPT
- Unspsc:
- 31161716 Locknuts
- Weight Uom:
- 21.63 lbs. per 100
- Department:
- Electrical
- Product Group:
- Conduit & Fittings
- Product Subgroup:
- Locknuts & Washers
- Product Type:
- Locknuts
- Product Finish:
- Zinc Plated
- Product Size:
- 3-1/2 Inch
- Product Details:
- Locknut for Conduit Fitting
- Product Material:
- Metal
Steel City SP LN109 – Frequently Asked Questions
1) What size conduit does the Steel City SP LN109 locknut fit?
The SP LN109 is a 3-1/2 inch locknut with NPT threads, so it mates with 3-1/2 inch trade size rigid or IMC conduit and 3-1/2 inch threaded conduit fittings. It will not thread onto any other trade size.
2) Will a zinc plated steel locknut hold up in a damp or outdoor electrical install?
The SP LN109 is steel with a zinc plated finish, which is the normal corrosion protection for indoor and typical dry or damp commercial locations. For continuously wet, washdown, or chemically corrosive areas, plated steel is not the material most specs call for.
3) Do I need a sealing locknut or will this standard one work?
The SP LN109 is a plain steel conduit locknut, not a sealing or grounding type. It bonds and secures a threaded conduit or fitting into an enclosure knockout in dry and standard indoor work. If your spec calls for a raintight or gasketed connection at the box, you need a sealing locknut instead; if it calls for a bonding bushing or grounding locknut with a lug, that is a different part.
4) Is the SP LN109 threaded NPT or is it a straight machine thread?
NPT, matching the tapered pipe thread cut on rigid and IMC conduit and on threaded hubs and fittings. It will not run correctly on straight-threaded EMT connector bodies, which take their own locknut.
5) What is the exact part number to order this Steel City 3-1/2 inch locknut?
Order it as Steel City SP LN109. That is the manufacturer part number, and the UNSPSC classification is 31161716 for locknuts if you are loading it into a procurement system.
How fast can I get the Steel City SP LN109 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Steel City SP LN109 come with a warranty?
Absolutely. The Steel City SP LN109 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Steel City SP LN109?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Steel City SP LN109 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.